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Method for manufacturing thick hot-rolled dual-phase steel based on CSP (Compact Strip Production) process

A technology for hot-rolled dual-phase steel and a manufacturing method, which is applied in the field of manufacturing hot-rolled dual-phase steel with a low-cost thickness specification of 590 MPa, can solve the problem that it is difficult to achieve stable matching of chemical composition-process window-structure and properties, and it is impossible to achieve dual-phase steel. Industrial production and application problems, to achieve the effect of reducing the difficulty of smelting, low cost, and ensuring stability

Inactive Publication Date: 2015-05-06
NORTHEASTERN UNIV +1
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  • Abstract
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Problems solved by technology

Therefore, under the conditions of the existing CSP process, limited by cooling equipment and process technology, it is difficult to achieve a stable matching of chemical composition-process window-microstructure properties for thick-gauge high-strength hot-rolled dual-phase steel, and it is impossible to realize this type of dual-phase steel. Industrial production and application of phase steel

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  • Method for manufacturing thick hot-rolled dual-phase steel based on CSP (Compact Strip Production) process
  • Method for manufacturing thick hot-rolled dual-phase steel based on CSP (Compact Strip Production) process
  • Method for manufacturing thick hot-rolled dual-phase steel based on CSP (Compact Strip Production) process

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Embodiment Construction

[0022] The following is a specific embodiment of the present invention. The embodiment is used to explain the present invention and is not used to limit the scope of the present invention.

[0023] The components of the actual molten steel in the embodiment are shown in Table 1 in terms of mass percentage.

[0024] The molten steel with the components of Examples 1 to 3 shown in Table 1 is pretreated → converter top and bottom composite blowing → LF refining treatment → thin slab continuous casting → tunnel furnace soaking → F1~F7 seven-stand hot continuous rolling mill continuous rolling →Laminar cooling system→Super fast cooling system→Reeling.

[0025] Table 1 Chemical composition of specific examples of the present invention (Wt.%)

[0026]

[0027] The continuous casting billet in the tunnel furnace soaking time is 10~25min, control and control the discharge temperature ≥1130℃, the opening temperature ≥1010℃, the F1 rolling mill stand reduction rate ≥40%, the F2 stand reduction r...

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Abstract

The invention discloses a method for manufacturing hot-rolled dual-phase steel based on a CSP (Compact Strip Production) process. The method comprises the following steps: (1) preparing a raw material comprising the following chemical compositions in percentage by weight: 0.055-0.070% of C, 0.40-0.50% of Si, 1.20-1.50% of Mn, less than or equal to 0.015% of P, less than or equal to 0.002% of S and the balance of Fe and unavoidable impurities; and (2) sequentially pretreating molten steel, carrying out converter top and bottom combined blowing, refining in an LF, continuously casting thin billet, soaking in a tunnel furnace, continuously rolling by virtue of an F1-F7 seven-stand hot continuous rolling mill group, cooling by virtue of a laminar cooling system, cooling by virtue of an ultra-fast cooling system and coiling. In the method, the out-of-furnace temperature of the continuous casting billet passing through the tunnel soaking furnace is equal to or greater than 1130 DEG C, the initial rolling temperature in the hot continuous rolling step is equal to or greater than 1010 DEG C, the reduction rate in an F1 stand is equal to or greater than 40%, the reduction rate in an F2 stand is equal to or greater than 33.3%, the temperature after the laminar cooling and air cooling is 600-690 DEG C, the temperature after ultra-fast cooling is 150-250 DEG C, the ultra-fast cooling speed is 70-150 DEG C / s. The microstructures of 11.0mm-thickness 590MPa-grade dual-phase steel in the thickness direction, which is produced from a simple low C-Mn-component system in an industrial mass manner, are ferrite and martensite duplex microstructures so that the dual-phase steel is excellent in comprehensive performance.

Description

Technical field [0001] The invention relates to a production process of a hot-rolled steel sheet, in particular to a method for manufacturing a 590MPa-class hot-rolled dual-phase steel with low-cost thickness specifications based on the CSP process. Background technique [0002] Hot-rolled dual-phase steel is mainly an advanced high-strength steel with a certain proportion of martensite dual-phase structure distributed on a ferrite matrix obtained from low-carbon steel or low-carbon alloy steel through controlled rolling and controlled cooling processes. Comprehensive mechanical properties, it is a widely used steel plate for automobiles. The 590MPa grade hot-rolled dual-phase steel with a thickness of 10.0~14.0mm is mainly used to manufacture truck wheels and beams, and the demand is huge. [0003] Compared with conventional hot rolling production lines, the production process of CSP (Compact Strip Production, also known as compact hot strip production process) production line is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C21D8/02
Inventor 袁国潘瑛唐贵士薛越利成宁康健王永民张昭李振垒王国栋任东升张玮张大治
Owner NORTHEASTERN UNIV
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